Give it time. Your LCR will indeed replace the LCP.
Actually, I have had an LCP since they first came out, and I picked up the LCR about a year ago.
Having carried the LCR for about a year, I can say that it will never replace my LCP in my pocket. The LCP is so slim that it can slip into and out of pockets much easier, and creates much less bulge in the pocket. It's just a much more comfortable gun.
The LCR is a belt gun for me. I wear it OWB in a Desantis Speed Scabbard at it disappears under an untucked t-shirt. Perfect for the hot muggy summers here in CT.